<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        background-color: #333;
      }
    </style>
  </head>
  <body>
    <script>
      const person = {
        title: '堂吉诃德',
        age: 18,
      };

      Reflect.defineProperty(person, 'title', {
        configurable: false,
      });

      const isDel = Reflect.deleteProperty(person, 'title');
      console.log(isDel);
    </script>
  </body>
</html>
